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Question: A Maple 2015 bug

Question:A Maple 2015 bug

sand15 1334 Maple 2015
multiplication matrix vector
1 hour ago
0

This is a report of  Maple_2015's bug, apparently fixed in more recent versions, but which may have persisted for a few versions beyond 2015.
I don't think it's necessary to fill out an RCS form.

Receiving the errors below is correct for the quantity  (I should behave written  R = A+ . B . A).
The bug is that there is no more error if A is a float vector and B a float matrix.

> 

restart
> 

kernelopts(version)

`Maple 2015.2, APPLE UNIVERSAL OSX, Dec 20 2015, Build ID 1097895`

 (1)
> 

A := Vector(2, symbol=a):
B := Matrix(2$2, symbol=b):
R := A.B.A^+

Error, (in LinearAlgebra:-Multiply) cannot multiply a column Vector and a Matrix

  
> 

A := Vector(2, i -> i):
B := Matrix(2$2, (i, j) -> i+j):
R := A.B.A^+

Error, (in LinearAlgebra:-Multiply) cannot multiply a column Vector and a Matrix

  
> 

A := evalf(Vector(2, i -> i)):
B := evalf(Matrix(2$2, (i, j) -> i+j)):
R := A.B.A^+

30.

 (2)
> 

R := A^+.B.A

30.

 (3)
 

 

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